Energy storage type charging pile

Abstract

The invention relates to the field of charging piles, in particular to an energy storage type charging pile. The alternating current power supply is connected with the direct current power pool I, and the direct current power pool I is connected with the direct current power pool II; the first direct-current power pool comprises a first alternating-current charging AC / DC module and a second alternating-current charging AC / DC module, and the first alternating-current charging AC / DC module and the second alternating-current charging AC / DC module are connected in parallel. The second direct current power pool comprises a first direct current charging DC / DC module and a second direct current charging DC / DC module, and the first direct current charging DC / DC module and the second direct current charging DC / DC module are connected in parallel. The system has an off-grid charging function, the auxiliary power supply is provided with a mains supply and battery double-power-taking loop, when the mains supply is powered off, the control power supply is driven by the battery, and the demand for off-grid charging of the vehicle is met; double direct-current power pools are configured, independent and combined operation of the power pools is achieved, and the requirements of different charging powers are met; adjustment is performed according to actual operation power of the power grid, and power grid pressure is reduced.

Description

Technical Field

[0001] The present invention relates to the field of charging piles, and particularly to an energy storage type charging pile. Background Art

[0002] At present, in places with relatively concentrated traffic such as commercial areas, city centers, and communities, charging piles face many difficulties such as limited power distribution capacity and tight charging spaces. However, increasing the capacity of power distribution equipment will face problems such as a large amount of capital investment and complex construction transformation, and will also lead to a larger peak-valley difference in load and a lower utilization rate of equipment. Therefore, how to meet the charging and emergency power supply needs of users under the current situation has become an important problem faced in the development of current charging facilities.

[0003] The present invention provides an energy storage type charging pile. The energy storage type charging pile adds battery packs with different capacities according to the needs of different customers in a traditional charging pile, and uses its battery energy storage function to store electric energy when the power supply is sufficient and charge electric vehicles when needed, thus providing fast and convenient charging services. Summary of the Invention

[0004] Aiming at the deficiencies in the design of conventional charging piles, the present invention provides an energy storage type charging pile. The product reduces the peak-valley difference of the load, improves the system efficiency and equipment utilization rate; increases the standby capacity, improves the safety of the power grid and the power supply quality; has the ability to smooth the power fluctuation of intermittent electric vehicle charging, can enhance the power grid frequency modulation and peak shaving capabilities, and can better meet the fast charging needs of users.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An energy storage type charging pile includes a first DC power pool, a second DC power pool, a battery cluster, a first DC charging gun, and a second DC charging gun. An AC power supply is connected to the first DC power pool, and the first DC power pool is connected to the second DC power pool; The first DC power pool includes a first AC charging AC / DC module and a second AC charging AC / DC module, and the first AC charging AC / DC module and the second AC charging AC / DC module are connected in parallel; The second DC power pool includes a first DC charging DC / DC module and a second DC charging DC / DC module, and the first DC charging DC / DC module and the second DC charging DC / DC module are connected in parallel; The first DC charging DC / DC module and the second DC charging DC / DC module are connected to the first DC charging gun; The second AC charging AC / DC module is connected to the second DC charging gun; A third AC charging AC / DC module is connected in parallel with the first AC charging AC / DC module and the second AC charging AC / DC module in the first DC power pool, and the third AC charging AC / DC module is connected to the battery cluster.

[0006] Further, the AC power supply is connected to the AC charging AC / DC module three and the DC power pool one through an AC incoming line circuit breaker and an AC contactor.

[0007] Further, one side of the AC charging AC / DC module one and one side of the AC charging AC / DC module two are connected by a line. A node is formed between one side of the AC charging AC / DC module one and the line, and a node two is formed between one side of the AC charging AC / DC module two and the line. One side of the AC charging AC / DC module one close to the node one is connected to the DC power pool two through a DC contactor one.

[0008] Further, one side of the DC charging DC / DC module one and one side of the DC charging DC / DC module two are connected to the DC charging gun one through a DC fuse two and a direct contactor four.

[0009] Further, one side of the AC charging AC / DC module two close to the node two is connected to the DC charging gun two through a DC fuse three and a DC contactor; A line is connected between the DC power pool two and the DC fuse two to the DC fuse three. A DC contactor three is arranged on this line, and the DC power pool two is connected to the DC fuse three through the DC contactor three.

[0010] Further, the other side of the AC charging AC / DC module three is connected to the DC charging DC / DC module one and the DC charging DC / DC module two through a line. At the same time, the other side of the AC charging AC / DC module three is sequentially connected to the battery cluster through a DC contactor two, a DC fuse one, and a DC circuit breaker.

[0011] Compared with the prior art, the beneficial effects of the invention are as follows: It has the function of off-grid charging, and the auxiliary power supply is provided with a dual-power supply circuit for mains power and battery. When the mains power is cut off, the control power is driven from the battery to meet the off-grid charging demand for vehicles; Two DC power pools are configured, which can realize the independent and combined operation of the power pools to meet the requirements of different charging powers; Balance the grid load, adjust according to the actual operating power of the grid, and reduce the grid pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Other features, objects, and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

[0013] Figure 1 It is a schematic diagram of the AC-DC coupling power supply principle of the present invention.

[0014] Figure 2 It is a schematic diagram of the system of the present invention.

[0015] Figure 3 It is a system topology diagram of the present invention. Detailed implementation mode

[0016] The present invention will be further described in detail below through embodiments. The embodiments are only used to illustrate the present invention and do not limit the scope of the present invention.

[0017] An energy storage type charging pile includes a first DC power pool, a second DC power pool, a battery cluster 6, a first DC charging gun 16, and a second DC charging gun 17. An AC power supply is connected to the first DC power pool, and the first DC power pool is connected to the second DC power pool. The first DC power pool includes a first AC charging AC / DC module 8 and a second AC charging AC / DC module 9, and the first AC charging AC / DC module 8 and the second AC charging AC / DC module 9 are connected in parallel. The second DC power pool includes a first DC charging DC / DC module 10 and a second DC charging DC / DC module 11, and the first DC charging DC / DC module 10 and the second DC charging DC / DC module 11 are connected in parallel; The first DC charging DC / DC module 10 and the second DC charging DC / DC module 11 are connected to the first DC charging gun 16; The second AC charging AC / DC module 9 is connected to the second DC charging gun 17; A third AC charging AC / DC module 7 is connected in parallel with the first AC charging AC / DC module 10 and the second AC charging AC / DC module 11 in the first DC power pool, and the third AC charging AC / DC module 7 is connected to the battery cluster 6.

[0018] Specifically, the AC power supply is connected to the third AC charging AC / DC module 7 and the first DC power pool through an AC incoming line circuit breaker 18 and an AC contactor 19; One side of the first AC charging AC / DC module 8 and one side of the second AC charging AC / DC module 9 are connected by a line. A node one 20 is formed between one side of the first AC charging AC / DC module 8 and the line, and a node two 21 is formed between one side of the second AC charging AC / DC module 9 and the line. One side of the first AC charging AC / DC module 8 close to the node one 20 is connected to the second DC power pool through a first DC contactor 1; One side of the first DC charging DC / DC module 10 and the second DC charging DC / DC module 11 is connected to the first DC charging gun 16 through a second DC fuse 14 and a fourth direct contactor 4; One side of the second AC charging AC / DC module 9 close to the node two 21 is connected to the second DC charging gun 17 through a third DC fuse 15 and a DC contactor 5; The second DC power pool is connected to the third DC fuse 15 through a line between the second DC fuse 14. A third DC contactor 3 is arranged on this line, and the second DC power pool is connected to the third DC fuse 15 through the third DC contactor 3; The other side of the AC / DC Module 3 of AC charging is connected to the DC / DC Module 1 of DC charging and the DC / DC Module 2 of DC charging through a circuit. At the same time, the other side of the AC / DC Module 3 of AC charging is connected to the battery cluster 6 through the DC Contactor 2, the DC Fuse 1 and the DC Circuit Breaker 12 in sequence. The operation control logic of this solution: The product system configuration is as shown in the figure: (The power of a single AC / DC module is 40kW, and the power of a single DC / DC module is 60kW) When no charging gun is working, the system operates 3 AC / DC modules, namely the AC / DC Module 1 of AC charging 8, the AC / DC Module 2 of AC charging 9 and the AC / DC Module 3 of AC charging 7, and closes the DC Contactor 1 and the DC Contactor 2 to charge the battery cluster 6 until the battery cluster 6 is fully charged.

[0019] When only the DC charging gun 1 is working, close the DC Contactor 4 and the DC Contactor 2, and open the DC Contactor 1, the DC Contactor 3 and the DC Contactor 5. The battery cluster 6 stops charging. When the system demand power is less than or equal to 120kW, only the AC / DC Module 3 of AC charging 7 operates and adds the power of the battery cluster 6 to supply the DC Power Pool 2, and then supplies the DC charging gun 1 through the DC Power Pool 2. If the required charging power is greater than 120kW, operate the remaining 2 AC / DC modules (the AC / DC Module 1 of AC charging 8 and the AC / DC Module 2 of AC charging 9), close the DC Contactor 3, and parallel the operating power of the 2 AC / DC modules. At this time, the maximum output of the DC charging gun 1 system can be 200kW.

[0020] When only the DC charging gun B is working, if the required charging power is less than or equal to 80kW, at this time, open the DC Contactor 1, the DC Contactor 3 and the DC Contactor 4, close the DC Contactor 2 and the DC Contactor 5, and operate the AC / DC Module 1 of AC charging 8 and the AC / DC Module 2 of AC charging 9 to supply power to the gun B, and the AC / DC Module 3 of AC charging continues to charge the battery cluster. If the required charging power is greater than 80kW, stop supplying power to the battery cluster, operate the DC / DC modules in the DC Power Pool 2, and the AC / DC Module 3 of AC charging and the battery cluster 6 supply the DC / DC modules in the DC Power Pool 2. In this way, the total output of the 2 DC / DC modules (the DC / DC Module 1 of DC charging 10 and the DC / DC Module 2 of DC charging 11) is 120kW. Close the DC Contactor 3, and parallel the operating power of the 2 DC / DC modules (the DC / DC Module 1 of DC charging 10 and the DC / DC Module 2 of DC charging 11). At this time, the maximum output of the DC charging gun 2 system can be 200kW.

[0021] When charging with two guns simultaneously, disconnect DC contactor 1 and DC contactor 3, and close DC contactor 2, DC contactor 4, and DC contactor 5. The first DC charging gun 16 supplies DC power to the DC / DC module inside the second DC power pool through the third AC charging AC / DC module 7 and the battery cluster 6, with a maximum power of 120 kW. The second DC charging gun 17 is charged through the first AC charging AC / DC module 8 and the second AC charging AC / DC module 9, with a maximum power of 80 kW.

[0022] The AC input circuit of this solution is equipped with a leakage circuit breaker and a contactor for protection, and a switching power supply module provides control and auxiliary working power for the charging pile.

[0023] The energy storage battery system and the charging control system mainly consist of an AC charging AC / DC module, a DC charging DC / DC module, a battery management system, and a charging control module. The charging module and the battery PACK use liquid cooling for heat dissipation, and a liquid cooling unit and liquid cooling pipes are configured for temperature control protection. The AC charging AC / DC module and the DC charging DC / DC module are the energy transmission links between the power grid and the energy storage battery pack and the electric vehicle battery pack, and between the energy storage battery pack and the vehicle battery pack.

[0024] The system is configured with two DC power pools, which can operate separately or in combination to meet the requirements of different charging powers.

[0025] The system is configured with an AC / DC charging module, and a first DC power pool is established on the DC side. The first DC power pool can supply power to the second DC charging gun 17 or charge the battery cluster 6. The DC / DC charging module of the second DC power pool configured in the system establishes a second DC power pool on the output side, which can be used to supply power to the first DC charging gun 16. When required by the system, the first DC power pool and the second DC power pool can be combined to supply power to the same charging gun.

[0026] The energy storage type charging pile adopts an AC-DC coupled power supply circuit, and all auxiliary power supplies are set with a dual-power supply circuit of mains and battery, with the function of off-grid charging. When the mains power fails, the control power is driven from the battery side power supply to meet the requirements of off-grid charging.

[0027] This solution: 1. Independent power supply ability: It has the ability of independent power supply and can continue to provide charging services for electric vehicles when the power grid is out of power or fails, ensuring the charging needs of electric vehicles.

[0028] 2. During peak power demand periods, it can release the stored electric energy, relieve the power grid pressure, and improve the power supply reliability.

[0029] 3. It can be flexibly configured and expanded according to actual needs to meet the charging requirements in different scenarios, and is applicable to various scenarios such as homes, public charging stations, commercial parks, and public facilities.

[0030] The energy storage charging pile provided by this solution can meet: 1. Improve energy utilization efficiency and economic benefits: The energy storage charging pile can store electric energy during low electricity consumption periods and release electric energy during high electricity consumption periods.

[0031] 1. Balance the grid load: By adopting the energy storage charging pile, the grid does not need to be over-expanded to meet the peak charging demand, thereby reducing the cost of the charging station's distribution lines, reducing the pressure on grid construction and transformation, and generating good social and economic benefits.

[0032] 3. Flexible application and strong reliability: The energy storage charging pile has the ability to supply power independently. When the grid power outage or fails, it can continue to provide charging services for electric vehicles relying on the electric energy stored in itself, ensuring the charging demand of electric vehicles. Moreover, through the configuration of the energy storage battery capacity, different charging requirements can be met, and the application is flexible.

[0033] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that this is only an example. The protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An energy storage charging pile, characterized in that: It includes a DC power pool 1, a DC power pool 2, a battery cluster, a DC charging gun 1 and a DC charging gun 2, an AC power source is connected to the DC power pool 1, and the DC power pool 1 is connected to the DC power pool 2; The DC power pool 1 includes an AC charging AC / DC module 1 and an AC charging AC / DC module 2, and the AC charging AC / DC module 1 and the AC charging AC / DC module 2 are connected in parallel; The DC power pool 2 includes a DC charging DC / DC module 1 and a DC charging DC / DC module 2, and the DC charging DC / DC module 1 and the DC charging DC / DC module 2 are connected in parallel; The DC charging DC / DC module 1 and the DC charging DC / DC module 2 are connected to the DC charging gun 1; The AC charging AC / DC module 2 is connected to the DC charging gun 2; The AC charging AC / DC module three is connected in parallel with the AC charging AC / DC module one and the AC charging AC / DC module two in the DC power pool one, and the AC charging AC / DC module three is connected to the battery cluster.

2. The energy storage charging pile according to claim 1, characterized in that: The AC power source is connected to the AC charging AC / DC module three and the DC power battery one through an AC incoming line breaker and an AC contactor.

3. The energy storage charging pile according to claim 2, characterized in that: One side of the AC charging AC / DC module one and one side of the AC charging AC / DC module two are connected through a line, one side of the AC charging AC / DC module one and the line form a node, one side of the AC charging AC / DC module two and the line form a node two, and the side of the AC charging AC / DC module one close to the node one is connected to the DC power pool two through the DC contactor one.

4. The energy storage charging pile according to claim 3, characterized in that: One side of the DC charging DC / DC module 1 and the DC charging DC / DC module 2 is connected to the DC charging gun 1 through the DC fuse 2 and the direct contactor 4.

5. The energy storage charging pile according to claim 4, characterized in that: The AC charging AC / DC module 2 is connected to the DC charging gun 2 via the DC fuse 3 and the DC contactor on the side close to the node 2; The DC power pool 2 is connected to the DC fuse 2 via a line and the DC fuse 3 is connected thereto. A DC contactor 3 is arranged on the line, and the DC power pool 2 is connected to the DC fuse 3 via the DC contactor 3.

6. The energy storage charging pile according to claim 5, characterized in that: The other side of the AC charging AC / DC module three is connected to the DC charging DC / DC module one and the DC charging DC / DC module two through a line, and the other side of the AC charging AC / DC module three is connected to the battery cluster through the DC contactor two, the DC fuse one and the DC circuit breaker in sequence.

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